EP3178937B1 - Molécules d'acide nucléique régulatrices pour l'amélioration de l'expression de gènes spécifiques des semences dans des plantes pour faciliter la synthèse améliorée d'acides gras polyinsaturés - Google Patents

Molécules d'acide nucléique régulatrices pour l'amélioration de l'expression de gènes spécifiques des semences dans des plantes pour faciliter la synthèse améliorée d'acides gras polyinsaturés Download PDF

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EP3178937B1
EP3178937B1 EP16205641.0A EP16205641A EP3178937B1 EP 3178937 B1 EP3178937 B1 EP 3178937B1 EP 16205641 A EP16205641 A EP 16205641A EP 3178937 B1 EP3178937 B1 EP 3178937B1
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nucleic acid
promoter
expression
dna
acid sequence
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EP3178937A1 (fr
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Toralf Senger
Jörg BAUER
Josef Martin Kuhn
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BASF Plant Science Co GmbH
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BASF Plant Science Co GmbH
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8216—Methods for controlling, regulating or enhancing expression of transgenes in plant cells
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8216—Methods for controlling, regulating or enhancing expression of transgenes in plant cells
    • C12N15/8222—Developmentally regulated expression systems, tissue, organ specific, temporal or spatial regulation
    • C12N15/823—Reproductive tissue-specific promoters
    • C12N15/8234—Seed-specific, e.g. embryo, endosperm
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8242—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits
    • C12N15/8243—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits involving biosynthetic or metabolic pathways, i.e. metabolic engineering, e.g. nicotine, caffeine
    • C12N15/8247—Phenotypically and genetically modified plants via recombinant DNA technology with non-agronomic quality (output) traits, e.g. for industrial processing; Value added, non-agronomic traits involving biosynthetic or metabolic pathways, i.e. metabolic engineering, e.g. nicotine, caffeine involving modified lipid metabolism, e.g. seed oil composition

Definitions

  • the invention in principle pertains to the field of recombinant manufacture of fatty acids. It provides novel nucleic acid molecules comprising nucleic acid sequences encoding fatty acid desaturases, elongases, acyltransferases, terminator sequences and high expressing seed-specific promoters operatively linked to the said nucleic acid sequences wherein nucleic acid expression enhancing nucleic acids (NEENAs) are functionally linked to said promoters.
  • NEENAs nucleic acid expression enhancing nucleic acids
  • the invention also provides recombinant expression vectors containing the nucleic acid molecules, host cells or host cell cultures into which the expression vectors have been introduced, and methods for large-scale production of long chain polyunsaturated fatty acids (LCPUFAs), e.g. arachidonic acid (ARA), eicosapentaenoic acid (EPA) or docosahexaenoic acid (DHA).
  • LCPUFAs long chain polyunsaturated fatty acids
  • ARA arachidonic acid
  • EPA eicosapentaenoic acid
  • DHA docosahexaenoic acid
  • transgenes in plants are strongly affected by various external and internal factors resulting in a variable and unpredictable level of transgene expression. Often a high number of transformants have to be produced and analyzed in order to identify lines with desirable expression strength. As transformation and screening for lines with desirable expression strength is costly and labor intensive there is a need for high expression of one or more transgenes in a plant. This problem is especially pronounced, when several genes have to be coordinately expressed in a transgenic plant in order to achieve a specific effect as a plant has to be identified in which each and every gene is strongly expressed.
  • WO 2008/104559 describes methods for producing polyunsaturated fatty acids in a transgenic organism by introducing nucleic acids that code for polypeptides having delta-5 desaturase, delta-6 elongase and/or delta-5 desaturase activity into the organism.
  • WO 2008/009600 describes a process for producing arachidonic acid or eicosapentaenoic acid or a combination thereof in the seed of transgenic Brassica plants.
  • introns have been recognized as genetic elements with a strong potential for improving gene expression. Although the mechanism is largely unknown, it has been shown that some introns positively affect the steady state amount of mature mRNA, possibly by enhanced transcriptional activity, improved mRNA maturation, enhanced nuclear mRNA export and/or improved translation initiation (e.g. Huang and Gorman, 1990; Le Hir et al., 2003; Nott et al., 2004). Since only selected introns were shown to increase expression, splicing as such is likely not accountable for the observed effects.
  • intron mediated enhancement of gene expression and has been shown in various monocotyledonous (e.g. Callis et al., 1987; Vasil et al., 1989; Bruce et al., 1990; Lu et al., 2008) and dicotyledonous plants (e.g. Chung et al., 2006; Kim et al., 2006; Rose et al., 2008).
  • ATG translational start site
  • EP 1645633 describes expression cassettes comprising transcription regulating nucleotide sequences with constitutive expression profiles in plants obtainable from Arabidopsis thaliana genes.
  • Database accession number AC 007323 describes the sequence of BAC clone T25K16 from Arabidopsis thaliana chromosome 1.
  • WO 99/67389 describes cryptic regulatory elements obtained from plants.
  • Thomas et al. Plant cell 2, p. 1171-1180, 1990 ) describes the identification of an enhancer element for the endosperm-specific expression of high molecular weight glutenin.
  • nucleic acid expression enhancing nucleic acids NEENA
  • Introns have the intrinsic feature to be spliced out of the respective pre-mRNA.
  • the nucleic acids presented in the application at hand do not necessarily have to be included in the mRNA or, if present in the mRNA, have not necessarily to be spliced out of the mRNA in order to enhance the expression derived from the promoter the NEENAs are functionally linked to.
  • a first embodiment of the invention pertains to a polynucleotide that promotes enhancing of polyunsaturated fatty acid synthesis, therefore it pertains in general in the recombinant manufacture of polyunsaturated fatty acids.
  • Fatty acids are carboxylic acids with long-chain hydrocarbon side groups that play a fundamental role in many biological processes. Fatty acids are rarely found free in nature but, rather, occur in esterified form as the major component of lipids. As such, lipids/ fatty acids are sources of energy (e.g., b-oxidation). In addition, lipids/ fatty acids are an integral part of cell membranes and, therefore, are indispensable for processing biological or biochemical information.
  • Fatty acids can be divided into two groups: saturated fatty acids formed of single carbon bonds and the unsaturated fatty acids which contain one or more carbon double bonds in cis- configuration.
  • Unsaturated fatty acids are produced by terminal desaturases that belong to the class of nonheme-iron enzymes. Each of these enzymes are part of an electron-transport system that involves one or two other proteins, namely cytochrome b 5 and NADH-cytochrome b 5 reductase.
  • the cytochrome b5 functionality can also be n-terminaly fused to the desaturase mojety of one single protein.
  • Such enzymes catalyze the formation of double bonds between the carbon atoms of a fatty acid molecule, for example, by catalyzing the oxygen-dependent dehydrogenation of fatty acids (Sperling et al., 2003).
  • Human and other mammals have a limited spectrum of desaturases that are required for the formation of particular double bonds in unsaturated fatty acids and thus, have a limited capacity for synthesizing essential fatty acids, e.g., long chain polyunsaturated fatty acids (LCPUFAs).
  • LCPUFAs long chain polyunsaturated fatty acids
  • Such essential fatty acids include, for example, linoleic acid (C18:2), linolenic acid (C18:3).
  • insects, microorganisms and plants are able to synthesize a much larger variety of unsaturated fatty acids and their derivatives. Indeed, the biosynthesis of fatty acids is a major activity of plants and microorganisms.
  • LCPUFAs Long chain polyunsaturated fatty acids
  • DHA docosahexaenoic acid
  • LCPUFAs Long chain polyunsaturated fatty acids
  • DHA docosahexaenoic acid
  • LCPUFAs Long chain polyunsaturated fatty acids
  • DHA docosahexaenoic acid
  • LCPUFAs Long chain polyunsaturated fatty acids
  • DHA docosahexaenoic acid
  • DHA is essential for the growth and development of the brain in infants, and for maintenance of normal brain function in adults ( Martinetz, M. (1992) J. Pediatr. 120:S129-S138 ). DHA also has significant effects on photoreceptor function involved in the signal transduction process, rhodopsin activation, and rod and cone development ( Giusto, N.M., et al. (2000) Prog. Lipid Res. 39:315-391 ). In addition, some positive effects of DHA were also found on diseases such as hypertension, arthritis, atherosclerosis, depression, thrombosis and cancers ( Horrocks, L.A.
  • DHA DHA
  • fish oil is a major and traditional source for this fatty acid, however, it is usually oxidized by the time it is sold.
  • the supply of fish oil is highly variable, particularly in view of the shrinking fish populations.
  • the algal source of oil is expensive due to low yield and the high costs of extraction.
  • EPA and ARA are both ⁇ 5 essential fatty acids. They form a unique class of food and feed constituents for humans and animals. EPA belongs to the n-3 series with five double bonds in the acyl chain. EPA is found in marine food and is abundant in oily fish from North Atlantic. ARA belongs to the n-6 series with four double bonds. The lack of a double bond in the ⁇ -3 position confers on ARA different properties than those found in EPA.
  • the eicosanoids produced from ARA have strong inflammatory and platelet aggregating properties, whereas those derived from EPA have anti-inflammatory and anti-platelet aggregating properties. ARA can be obtained from some foods such as meat, fish and eggs, but the concentration is low.
  • GLA Gamma-linolenic acid
  • GLA is another essential fatty acid found in mammals.
  • GLA is the metabolic intermediate for very long chain n-6 fatty acids and for various active molecules.
  • formation of long chain polyunsaturated fatty acids is rate-limited by ⁇ 6 desaturation.
  • Many physiological and pathological conditions such as aging, stress, diabetes, eczema, and some infections have been shown to depress the ⁇ 6 desaturation step.
  • GLA is readily catabolized by the oxidation and rapid cell division associated with certain disorders, e.g., cancer or inflammation. Therefore, dietary supplementation with GLA can reduce the risks of these disorders.
  • Clinical studies have shown that dietary supplementation with GLA is effective in treating some pathological conditions such as atopic eczema, premenstrual syndrome, diabetes, hypercholesterolemia, and inflammatory and cardiovascular disorders.
  • DHA is a n-3 very long chain fatty acid with six double bonds.
  • the present invention relates to a polynucleotide comprising a seed specific promoter and a heterologous expression enhancing element (NEENA) functionally linked to said promoter, and further comprising a nucleic acid sequence to be expressed under the control of said promoter, wherein the NEENA is selected from
  • polynucleotide as used in accordance with the present invention relates to a polynucleotide comprising a nucleic acid sequence which encodes a polypeptide having desaturase or elongase activity.
  • the polypeptide encoded by the polynucleotide of the present invention having desaturase, or elongase activity upon expression in a plant shall be capable of increasing the amount of PUFA and, in particular, LCPUFA in, e.g., seed oils or the entire plant or parts thereof.
  • Such an increase is, preferably, statistically significant when compared to a LCPUFA producing transgenic control plant which expresses the present state of the art set of desaturases and elongases required for LCPUFA synthesis but does not express the polynucleotide of the present invention. Whether an increase is significant can be determined by statistical tests well known in the art including, e.g., Student's t-test. More preferably, the increase is an increase of the amount of triglycerides containing LCPUFA of at least 5%, at least 10%, at least 15%, at least 20% or at least 30% compared to the said control.
  • the LCPUFA referred to before is a polyunsaturated fatty acid having a C-20 or C-22 fatty acid body, more preferably, ARA, EPA or DHA.
  • Suitable assays for measuring the activities mentioned before are described in the accompanying Examples.
  • desaturase or " elongase” as used herein refers to the activity of a desaturase, introducing a double bond into the carbon chain of a fatty acid, preferably into fatty acids with 18, 20 or 22 carbon molecules, or an elongase, introducing two carbon molecules into the carbon chain of a fatty acid, preferably into fatty acids with 18, 20 or 22 carbon molecules
  • Preferred polynucleotides are those having a nucleic acid sequence as shown in SEQ ID NOs: 95, 96, 97, 98, 99, 100 or 101 encoding for polypeptides that exhibit desaturase or elongase activity (see table 3).
  • polynucleotides are those having a nucleic acid sequence are shown in SEQ ID NOs: 102 or 103 encoding a polypeptide having desaturase or elongase activity (see table 4, also), that are especially used in addition to the polynucleotides listed in table 3 for synthesis of 22:6n-3 (DHA), i.e. in rapeseed.
  • DHA 22:6n-3
  • a preferred seed-specific promoter as meant herein is selected from the group consisting of Napin, USP, Conlinin, SBP, Fae, Arc and LuPXR.
  • Other most preferred seed-specific promoters as meant herein are encoded by a nucleic acid sequence as shown in SEQ ID NOs: 25, 26, 27, 28, 29 or 30.
  • a person skilled in the art is aware of methods for rendering a unidirectional to a bidirectional promoter and of methods to use the complement or reverse complement of a promoter sequence for creating a promoter having the same promoter specificity as the original sequence. Such methods are for example described for constitutive as well as inducible promoters by Xie et al.
  • NEENA as described below is used for the expression " nucleic acid expression enhancing nucleic acid” referring to a sequence and/or a nucleic acid molecule of a specific sequence having the intrinsic property to enhance expression of a nucleic acid under the control of a promoter to which the NEENA is functionally linked.
  • a high expression promoter functionally linked to a NEENA as claimed is functional in complement or reverse complement and therefore the NEENA is functional in complement or reverse complement, too.
  • the NEENA may be functionally linked to any promoter such as tissue specific, inducible, developmental specific or constitutive promoters.
  • the respective NEENA will lead to an enhanced seed-specific expression of the heterologous nucleic acid under the control of the respective promoter to which the one or more NEENA is functionally linked.
  • the enhancement of expression of promoters other than seed-specific promoters, for example constitutive promoters or promoters with differing tissue specificity, will influence the specificity of these promoters.
  • Expression of the nucleic acid under control of the respective promoter will be significantly increased in seeds, where the transcript of said nucleic acid may have not or only weakly been detected without the NEENA functionally linked to its promoter.
  • tissue- or developmental specific or any other promoter may be rendered to seed-specific promoters by functionally linking one or more of the NEENA molecules as described above to said promoter.
  • a preferred NEENA as for the present invention is encoded by the sequence shown in SEQ ID NO: 10. Also (i) a nucleic acid molecule having a sequence with an identity of 80% or more to the sequence as defined by SEQ ID NO: 10, preferably, the identity is 85% or more, more preferably the identity is 90% or more, even more preferably, the identity is 95% or more, 96% or more, 97% or more, 98% or more or 99% or more, in the most preferred embodiment, the identity is 100% to the sequence as defined by SEQ ID NO: 10 or (ii) a fragment of 100 bases or more consecutive bases, preferably 150 or more consecutive bases, more preferably 200 consecutive bases or more even more preferably 250 or more consecutive bases of a nucleic acid molecule of i) or ii) which enhances the expression of the nucleic acid sequence to be expressed under the control of said promoter, for example 65% or more, preferably 70% or more, more preferably 75% or more, even more preferably 80% or more, 85% or more or 90%
  • NEENAs with SEQ ID NOs 6 to 9 and 11 to 24 are disclosed for illustrative purposes only.
  • nucleic acid molecule of 100 nucleotides or more, 150 nucleotides or more, 200 nucleotides or more or 250 nucleotides or more, hybridizing under conditions equivalent to hybridization in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50°C with washing in 2 X SSC, 0.1% SDS at 50°C or 65°C, preferably 65°C to a nucleic acid molecule comprising at least 50, preferably at least 100, more preferably at least 150, even more preferably at least 200, most preferably at least 250 consecutive nucleotides of a transcription enhancing nucleotide sequence described by SEQ ID NO: 10 or the complement thereof.
  • said nucleic acid molecule is hybridizing under conditions equivalent to hybridization in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50°C with washing in 1 X SSC, 0.1% SDS at 50°C or 65°C, preferably 65°C to a nucleic acid molecule comprising at least 50, preferably at least 100, more preferably at least 150, even more preferably at least 200, most preferably at least 250 consecutive nucleotides of a transcription enhancing nucleotide sequence described by SEQ ID NO: 10 or the complement thereof, more preferably, said nucleic acid molecule is hybridizing under conditions equivalent to hybridization in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50°C with washing in 0,1 X SSC, 0.1% SDS at 50°C or 65°C, preferably 65°C to a nucleic acid molecule comprising at least 50, preferably
  • the NEENA of the invention is functionally linked to seed-specific promoters and will enhance expression of the nucleic acid molecule under control of said promoter.
  • Seed-specific promoters to be used in any method of the invention may be derived from plants, for example monocotyledonous or dicotyledonous plants, from bacteria and/or viruses or may be synthetic promoters.
  • Seed specific promoters to be used functionally linked to the NEENA of the invention are in a preferred embodiment the seed-specific promoters shown in table 5.
  • the high expression seed-specific promoters functionally linked to the NEENA of the invention may be employed in any plant comprising for example moss, fern, gymnosperm or angiosperm, for example monocotyledonous or dicotyledonous plant.
  • said promoter of the invention functionally linked to the NEENA may be employed in monocotyledonous or dicotyledonous plants, preferably crop plant such as corn, soy, canola, cotton, potato, sugar beet, rice, wheat, sorghum, barley, musa, sugarcane, miscanthus and the like.
  • said promoter which is functionally linked to the NEENA of the invention may be employed in monocotyledonous crop plants such as corn, rice, wheat, sorghum, barley, musa, miscanthus or sugarcane.
  • the promoter functionally linked to the NEENA of the invention may be employed in dicotyledonous crop plants such as soy, canola, cotton or potato.
  • a high expressing seed-specific promoter as used in the application means for example a promoter which is functionally linked to the NEENA of the invention causing enhanced seed-specific expression of the promoter in a plant seed or part thereof wherein the accumulation of RNA or rate of synthesis of RNA in seeds derived from the nucleic acid molecule under the control of the respective promoter functionally linked to the NEENA of the invention is higher, preferably significantly higher than the expression in seeds caused by the same promoter lacking the NEENA of the invention.
  • the amount of RNA of the respective nucleic acid and/or the rate of RNA synthesis and/or the RNA stability in a plant is increased 50% or more, for example 100% or more, preferably 200% or more, more preferably 5 fold or more, even more preferably 10 fold or more, most preferably 20 fold or more for example 50 fold compared to a control plant of same age grown under the same conditions comprising the same seed-specific promoter the latter not being functionally linked to the NEENA of the invention.
  • the promoter may be functionally linked to a marker gene such as GUS, GFP or luciferase and the activity of the respective protein encoded by the respective marker gene may be determined in the plant or part thereof.
  • a marker gene such as GUS, GFP or luciferase
  • the method for detecting luciferase is described in detail below.
  • Other methods are for example measuring the steady state level or synthesis rate of RNA of the nucleic acid molecule controlled by the promoter by methods known in the art, for example Northern blot analysis, qPCR, run-on assays or other methods described in the art, or detecting the encoded protein using specific antibodies by methods known in the art, e.g. Western Blot and/or enzyme-linked immunosorbent assay (ELISA).
  • ELISA enzyme-linked immunosorbent assay
  • a skilled person is aware of various methods for functionally linking two or more nucleic acid molecules. Such methods may encompass restriction/ligation, ligase independent cloning, recombineering, recombination or synthesis. Other methods may be employed to functionally link two or more nucleic acid molecules.
  • nucleic acid molecule or DNA refers to a nucleic acid molecule which is operably linked to, or is manipulated to become operably linked to, a second nucleic acid molecule to which it is not operably linked in nature, or to which it is operably linked at a different location in nature.
  • NEENA of the invention is in its natural environment functionally linked to its native promoter, whereas in the present invention it is linked to another promoter which might be derived from the same organism, a different organism or might be a synthetic promoter.
  • the NEENA of the present invention is linked to its native promoter but the nucleic acid molecule under control of said promoter is heterologous to the promoter comprising its native NEENA. It is in addition to be understood that the promoter and/or the nucleic acid molecule under the control of said promoter functionally linked to the NEENA of the invention are heterologous to said NEENA as their sequence has been manipulated by for example mutation such as insertions, deletions and the forth so that the natural sequence of the promoter and/or the nucleic acid molecule under control of said promoter is modified and therefore have become heterologous to the NEENA of the invention.
  • the NEENA is heterologous to the nucleic acid to which it is functionally linked when the NEENA is functionally linked to its native promoter wherein the position of the NEENA in relation to said promoter is changed so that the promoter shows higher expression after such manipulation.
  • a plant exhibiting enhanced seed-specific expression of a nucleic acid molecule as meant herein means a plant having a higher, preferably statistically significant higher seed-specific expression of a nucleic acid molecule compared to a control plant grown under the same conditions without the respective NEENA functionally linked to the respective nucleic acid molecule.
  • Such control plant may be a wild-type plant or a transgenic plant comprising the same promoter controlling the same gene as in the plant of the invention wherein the promoter is not linked to the NEENA of the invention.
  • the NEENA may be heterologous to the nucleic acid molecule which is under the control of said promoter to which the NEENA is functionally linked or it may be heterologous to both the promoter and the nucleic acid molecule under the control of said promoter.
  • elongase activity refers to the activity of the entire elongation complex as defined in the passage below and it is also be understood as the activity of the first component of the elongation complex with beta-ketoacyl-CoA synthase activity, which determines the substrate specificity of the entire elongation complex.
  • the polynucleotide of the present invention needs also comprising:
  • the polynucleotide of the present invention comprises a nucleic acid sequence encoding a fatty acid dehydratase-/enoyl-CoA reductase (nECR) protein having an activity of catalyzing the dehydration and reduction of fatty acid elongated intermediates.
  • nECR fatty acid dehydratase-/enoyl-CoA reductase
  • Fatty acid elongation is catalyzed in four steps, represented by four enzymes: KCR ( ⁇ -keto-acyl-CoA-synthase), KCR ( ⁇ -keto-acyl-CoA reductase), DH (dehydratase) and ECR (enoyl-CoA-reductase) forming the entire elongation complex.
  • KCR ⁇ -keto-acyl-CoA-synthase
  • KCR ⁇ -keto-acyl-CoA reductase
  • DH dehydratase
  • ECR enoyl-CoA-reductase
  • DH cleaves of the hydroxyl-group (H 2 O is produced), forming a 2-acylen-CoA ester.
  • the double bound at position 2, 3 is reduced by the ECR forming the elongated acyl-CoA ester (Buchanan, Gruissem, Jones (2000) Biochemistry & Molecular biology of plants, American Society of Plant Physiologists).
  • DH and ECR activity might also be confered by one single protein beeing a natural or artificial fusion of a DH-mojety and a ECR mojety, refered to as novel enoyl-CoA-reductase (nECR) in the present infention.
  • nucleic acid sequences defined in e) to f) could be comprised in the polynucleotide or only at least one of these nucleic acid sequences defined in e) to f) could be comprised in the polynucleotide in any combination occurred from different oganisms.
  • a polynucleotide comprising a fragment of any of the aforementioned nucleic acid sequences is also encompassed as a nucleic acid molecule of the present invention.
  • the fragment shall encode a polypeptide which still has nECR activity as specified above.
  • the polypeptide may comprise or consist of the domains of the polypeptide of the present invention conferring the said biological activity.
  • a fragment as meant herein preferably, comprises at least 15, at least 20, at least 50, at least 100, at least 250 or at least 500 consecutive nucleotides of any one of the aforementioned nucleic acid sequences or encodes an amino acid sequence comprising at least 5, at least 10, at least 20, at least 30, at least 50, at least 80, at least 100 or at least 150 consecutive amino acids of any one of the aforementioned amino acid sequences.
  • variant nucleic acid molecule or fragments referred to above preferably, encode polypeptides retaining at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80% or at least 90% of the nECR activity exhibitited by the polypeptide encoded by the nucleotide sequences.
  • polynucleotide as used in accordance with the present invention also relates to a polynucleotide comprising a nucleic acid sequence which encodes a polypeptide having acyltransferase activity.
  • the polypeptide encoded by the polynucleotide of the present invention having acyltransferaes activity upon expression in a plant shall be capable of increasing the amount of PUFA and, in particular, LCPUFA esterified to triglycerides in, e.g., seed oils or the entire plant or parts thereof.
  • Such an increase is, preferably, statistically significant when compared to a LCPUFA producing transgenic control plant which expresses the minimal set of desaturases and elongases requiered for LCPUFA synthesis but does not express the polynucleotide of the present invention.
  • a transgenic plant may, preferably, express desaturases and elongases comprised by the vector LJB765 listed in table 11 of example 5 in WO 2009/016202 or a similar set of desaturases and elongases required for DHA synthesis. Whether an increase is significant can be determined by statistical tests well known in the art including, e.g., Student's t-test.
  • the increase is an increase of the amount of triglycerides containing LCPUFA of at least 5%, at least 10%, at least 15%, at least 20% or at least 30% compared to the said control.
  • the LCPUFA referred to before is a polyunsaturated fatty acid having a C-20, C-22 or C24 fatty acid body, more preferably, EPA or DHA, most preferably, DHA.
  • Suitable assays for measuring the activities mentioned before are described in the accompanying Examples.
  • Variant nucleic acid molecules as referred above may be obtained by various natural as well as artificial sources.
  • nucleic acid molecules may be obtained by in vitro and in vivo mutagenesis approaches using the above mentioned specific nucleic acid molecules as a basis.
  • nucleic acid molecules being homologs or orthologs may be obtained from various animal, plant or fungus species.
  • they are obtained from plants such as algae, for example Isochrysis, Mantoniella, Ostreococcus or Crypthecodinium, algae/diatoms such as Phaeodactylum, Thalassiosira or Thraustochytrium, mosses such as Physcomitrella or Ceratodon, or higher plants such as the Primulaceae such as Aleuritia, Calendula stellata, Osteospermum spinescens or Osteospermum hyoseroides, microorganisms such as fungi, such as Aspergillus, Phytophthora, Entomophthora, Mucor or Mortierella, bacteria such as Shewanella, yeasts or animals.
  • algae for example Isochrysis, Mantoniella, Ostreococcus or Crypthecodin
  • the nucleic acid molecules may, preferably, be derived from Euteleostomi, Actinopterygii; Neopterygii; Teleostei; Euteleostei, Protacanthopterygii, Salmoniformes; Salmonidae or Oncorhynchus, more preferably, from the order of the Salmoniformes, most preferably, the family of the Salmonidae, such as the genus Salmo, for example from the genera and species Oncorhynchus mykiss, Trutta trutta or Salmo trutta fario.
  • the nucleic acid molecules may be obtained from the diatoms such as the genera Thallasiosira or Phaeodactylum.
  • the present invention also relates to a polynucleotide comprising at least one nucleic acid sequence encoding a polypeptide having acyltransferase activity additionally to the above-mentioned polypeptides exhibit desaturase, elongase orbeta-ketoacyl reductase, dehydratase or enoyl-CoA reductase activity.
  • the polynucleotide of the present invention also comprising at least one nucleic acid sequence encoding a polypeptide having acyltransferase activity, wherein the nucleic acid sequence is heterologous to said polypeptide having desaturase, elongase, beta-ketoacyl reductase, dehydratase or enoyl-CoA reductase activity and wherein at least one seed-specific plant promoter and at least one terminator sequence are operatively linked to the said nucleic acid sequence and wherein the nucleic acid expression enhancing nucleic acid (NEENA) molecule is/are functionally linked to said promoter and which is/are heterologous to said promoter.
  • NEENA nucleic acid expression enhancing nucleic acid
  • acyltransferase activity or " acyltransferase” as used herein encompasses all enymatic activities and enzymes which are capable of transferring or are involved in the transfer of PUFA and, in particular LCPUFA from the acly-CoA pool or the membrane phospholipids to the triglycerides, from the acyl-CoA pool to membrane lipids and from membrane lipids to the acyl-CoA pool by a transesterification process. It will be understood that this acyltransferase activity will result in an increase of the LCPUFA esterified to triglycerides in, e.g., seed oils.
  • these acyltransferases are capable of producing triglycerides having esterified EPA or even DHA, or that these acyltransferases are capable of enhancing synthesis of desired PUFA by increasing the flux for specific intermediates of the desired PUFA between the acyl-CoA pool (the site of elongation) and membrane lipids (the predominant site of desaturation).
  • acyltransferase activity as used herein pertains to lysophospholipid acyltransferase (LPLAT) activity, preferably, lysophosphatidylcholine acyltransferase (LPCAT) or lysophosphophatidylethanolamine acyltransferase (LPEAT) activity, lysophosphosphatidic acid acyltransferase (LPAAT) activity, phospholipid:diacylglycerol acyltransferase (PDAT) activity, glycerol-3-phosphate acyltransferase (GPAT) activity or diacylglycerol acyltransferase (DGAT), and, more preferably, to PLAT, LPAAT, DGAT, PDAT or GPAT activity.
  • LPAAT lysophospholipid acyltransferase
  • LPCAT lysophosphatidylcholine acyltransferas
  • a polynucleotide encoding a polypeptide having a acyltransferase activity as specified above could be obtained for example from Phythophthora infestans .
  • Polynucleotides encoding a polypeptide having desaturase or elongase activity as specified above could be obtained in accordance with the present invention from Thraustochytrium ssp. for example.
  • Preferred acyltransferases which shall be present in the host cell are at least one enzyme selected from the group consisting of: LPLATs, LPAATs, DGATs, PDATs and GPATs.
  • LPLATs LPLAT(Ce) from Caenorhabditis elegans (WO2004076617 ), LPCAT(Ms) from Mantoniella squamata ( WO2006069936 ) and LPCAT(Ot) from Ostreococcus tauri ( WO2006069936 ), pLPLAT_01332(Pi) (SEQ-ID No.:104 encoding the polypeptide SEQ-ID No.:125) pLPLAT_01330(Pi) (SEQ-ID No.:105 encoding the polypeptide SEQ-ID No.:126), pLPLAT_07077(Pi) (SEQ-ID No.:106 encoding the polypeptide SEQ-ID No.:127), LPLAT_18374(Pi) (SEQ-ID No.:107 encoding the polypeptide SEQ-ID No.:128), pLPLAT_14816(Pi) (SEQ-ID No.:
  • orthologs, paralogs or other homologs may be identified from other species.
  • they are obtained from plants such as algae, for example Isochrysis, Mantoniella, Ostreococcus or Crypthecodinium, algae/diatoms such as Phaeodactylum or Thalassiosira or Thraustochytrium, mosses such as Physcomitrella or Ceratodon, or higher plants such as the Primulaceae such as Aleuritia, Calendula stellata, Osteospermum spinescens or Osteospermum hyoseroides, microorganisms such as fungi, such as Aspergillus, Phytophthora, Entomophthora, Mucor or Mortierella, bacteria such as Shewanella, yeasts or animals.
  • algae for example Isochrysis, Mantoniella, Ostreococcus or Crypthecodinium
  • the nucleic acid molecules may, preferably, be derived from Euteleostomi, Actinopterygii; Neopterygii; Teleostei; Euteleostei, Protacanthopterygii, Salmoniformes; Salmonidae or Oncorhynchus, more preferably, from the order of the Salmoniformes, most preferably, the family of the Salmonidae, such as the genus Salmo, for example from the genera and species Oncorhynchus mykiss, Trutta trutta or Salmo trutta fario.
  • the nucleic acid molecules may be obtained from the diatoms such as the genera Thallasiosira or Phaeodactylum.
  • polynucleotide as used in accordance with the present invention further encompasses variants of the aforementioned specific polynucleotides representing orthologs, paralogs or other homologs of the polynucleotide of the present invention.
  • variants of the polynucleotide of the present invention also include artificially generated muteins.
  • Said muteins include, e.g., enzymes which are generated by mutagenesis techniques and which exhibit improved or altered substrate specificity, or codon optimized polynucleotides.
  • the polynucleotide variants preferably, comprise a nucleic acid sequence characterized in that the sequence can be derived from the aforementioned specific nucleic acid sequences shown in any one of SEQ ID NOs: 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,123 or 124 by a polynucleotide encoding a polypeptide having an amino acid sequence (i.e.
  • variant nucleic acid sequence shall still encode a polypeptide having a desaturase or elongase activity as specified above.
  • variant nucleic acid sequence shall still encode a polypeptide having a desaturase or elongase activity as specified above.
  • variant nucleic acid sequence also encompass polynucleotides comprising a nucleic acid sequence which is capable of hybridizing to the aforementioned specific nucleic acid sequences, preferably, under stringent hybridization conditions.
  • stringent hybridization conditions are known to the skilled worker and can be found in Current Protocols in Molecular Biology, John Wiley & Sons, N. Y. (1989), 6.3.1-6.3.6 .
  • SSC sodium chloride/sodium citrate
  • the temperature differs depending on the type of nucleic acid between 42°C and 58°C in aqueous buffer with a concentration of 0.1 to 5 ⁇ SSC (pH 7.2). If organic solvent is present in the abovementioned buffer, for example 50% formamide, the temperature under standard conditions is approximately 42°C.
  • the hybridization conditions for DNA: DNA hybrids are, preferably, 0.1 ⁇ SSC and 20°C to 45°C, preferably between 30°C and 45°C.
  • the hybridization conditions for DNA:RNA hybrids are, preferably, 0.1 ⁇ SSC and 30°C to 55°C, preferably between 45°C and 55°C.
  • the skilled worker knows how to determine the hybridization conditions required by referring to textbooks such as the textbook mentioned above, or the following textbooks: Sambrook et al., "Molecular Cloning” , Cold Spring Harbor Laboratory, 1989 ; Hames and Higgins (Ed.) 1985, " Nucleic Acids Hybridization: A Practical Approach” , IRL Press at Oxford University Press, Oxford ; Brown (Ed.) 1991, “Essential Molecular Biology: A Practical Approach” , IRL Press at Oxford University Press, Oxford .
  • polynucleotide variants are obtainable by PCR-based techniques such as mixed oligonucleotide primer- based amplification of DNA, i.e. using degenerated primers against conserved domains of the polypeptides of the present invention.
  • conserved domains of the polypeptide of the present invention may be identified by a sequence comparison of the nucleic acid sequences of the polynucleotides or the amino acid sequences of the polypeptides of the present invention.
  • Oligonucleotides suitable as PCR primers as well as suitable PCR conditions are described in the accompanying Examples.
  • DNA or cDNA from bacteria, fungi, plants or animals may be used.
  • variants include polynucleotides comprising nucleic acid sequences which are at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 98% or at least 99% identical to the nucleic acid sequences shown in any one of SEQ ID NOs: 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,123 or 124 preferably, encoding polypeptides retaining a desaturase, elongase, or acyltransferase activity as specified above.
  • polynucleotides which comprise nucleic acid sequences encoding a polypeptide having an amino acid sequences which are at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, at least 95%, at least 98% or at least 99% identical to the amino acid sequences encoded by the nucleic acid sequences shown in any one of SEQ ID NOs: 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,123 or 124 (i.e.
  • polypeptide preferably retains desaturase, elongase or acyltransferase activity as specified above.
  • the percent identity values are, preferably, calculated over the entire amino acid or nucleic acid sequence region. A series of programs based on a variety of algorithms is available to the skilled worker for comparing different sequences.
  • the percent identity between two amino acid sequences is determined using the Needleman and Wunsch algorithm ( Needleman 1970, J. Mol. Biol. (48):444-453 ) which has been incorporated into the needle program in the EMBOSS software package ( EMBOSS: The European Molecular Biology Open Software Suite, Rice,P., Longden,I., and Bleasby,A, Trends in Genetics 16(6), 276-277, 2000 ), using either a BLOSUM 45 or PAM250 scoring matrix for distantly related proteins, or either a BLOSUM 62 or PAM160 scoring matrix for closer related proteins, and a gap opening penalty of 16, 14, 12, 10, 8, 6, or 4 and a gap entension pentalty of 0.5, 1, 2, 3, 4, 5, or 6.
  • parameters to be used for aligning two amino acid sequences using the needle program are the default parameters, including the EBLOSUM62 scoring matrix, a gap opening penalty of 10 and a gap extension penalty of 0.5.
  • the percent identity between two nucleotide sequences is determined using the needle program in the EMBOSS software package ( EMBOSS: The European Molecular Biology Open Software Suite, Rice,P., Longden,I., and Bleasby,A, Trends in Genetics 16(6), 276-277, 2000 ), using the EDNAFULL scoring matrix and a gap opening penalty of 16, 14, 12, 10, 8, 6, or 4 and a gap extension penalty of 0.5,1, 2, 3, 4, 5, or 6.
  • EMBOSS The European Molecular Biology Open Software Suite, Rice,P., Longden,I., and Bleasby,A, Trends in Genetics 16(6), 276-277, 2000
  • a preferred, non-limiting example of parameters to be used in conjunction for aligning two amino acid sequences using the needle program are the default parameters, including the EDNAFULL scoring matrix, a gap opening penalty of 10 and a gap extension penalty of 0.5.
  • nucleic acid and protein sequences of the present invention can further be used as a "query sequence" to perform a search against public databases to, for example, identify other family members or related sequences. Such searches can be performed using the BLAST series of programs (version 2.2) of Altschul et al. ( Altschul 1990, J. Mol. Biol. 215:403-10 ). BLAST using nucleic acid sequences of the invention as query sequence can be performed with the BLASTn, BLASTx or the tBLASTx program using default parameters to obtain either nucleotide sequences (BLASTn, tBLASTx) or amino acid sequences (BLASTx) homologous to sequences encoded by the nucleic acid sequences of the invention.
  • BLAST using protein sequences encoded by the nucleic acid sequences of the invention as query sequence can be performed with the BLASTp or the tBLASTn program using default parameters to obtain either amino acid sequences (BLASTp) or nucleic acid sequences (tBLASTn) homologous to sequences of the invention.
  • Gapped BLAST using default parameters can be utilized as described in Altschul et al. ( Altschul 1997, Nucleic Acids Res. 25(17):3389-3402 ).
  • the following block diagram shows the relation of sequence types of query and hit sequences for various BLASt programs Input query sequence Converted Query Algorithm Converted Hit Actual Database DNA BLASTn DNA PRT BLASTp PRT DNA PRT BLASTx PRT PRT tBLASTn PRT DNA DNA PRT tBLASTx PRT DNA
  • a polynucleotide comprising a fragment of any of the aforementioned nucleic acid sequences is also encompassed as a polynucleotide of the present invention.
  • the fragment shall encode a polypeptide which still has desaturase and elongase activity as specified above. Accordingly, the polypeptide may comprise or consist of the domains of the polypeptide of the present invention conferring the said biological activity.
  • a fragment as meant herein preferably, comprises at least 50, at least 100, at least 250 or at least 500 consecutive nucleotides of any one of the aforementioned nucleic acid sequences or encodes an amino acid sequence comprising at least 20, at least 30, at least 50, at least 80, at least 100 or at least 150 consecutive amino acids of any one of the aforementioned amino acid sequences.
  • variant polynucleotides or fragments referred to above preferably, encode polypeptides retaining desaturase or elongase activity to a significant extent, preferably, at least 10%, at least 20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at least 80% or at least 90% of the desaturase and elongase activity exhibited by any of the polypeptide encoded by the nucleic acid sequences shown in any one of SEQ ID NOs: 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122,123 or 124 (i.e.
  • polynucleotides of the present invention either essentially consist of the aforementioned nucleic acid sequences or comprise the aforementioned nucleic acid sequences. Thus, they may contain further nucleic acid sequences as well.
  • the polynucleotide of the present invention may comprise in addition to an open reading frame further untranslated sequence at the 3' and at the 5' terminus of the coding gene region: at least 500, preferably 200, more preferably 100 nucleotides of the sequence upstream of the 5' terminus of the coding region and at least 100, preferably 50, more preferably 20 nucleotides of the sequence downstream of the 3' terminus of the coding gene region.
  • polynucleotides of the present invention may encode fusion proteins wherein one partner of the fusion protein is a polypeptide being encoded by a nucleic acid sequence recited above.
  • fusion proteins may comprise as additional part other enzymes of the fatty acid or PUFA biosynthesis pathways, polypeptides for monitoring expression (e.g., green, yellow, blue or red fluorescent proteins, alkaline phosphatase and the like) or so called " tags" which may serve as a detectable marker or as an auxiliary measure for purification purposes.
  • tags for the different purposes are well known in the art and comprise FLAG-tags, 6-histidine-tags, MYC-tags and the like.
  • the polynucleotide of the present invention shall be provided, preferably, either as an isolated polynucleotide (i.e. purified or at least isolated from its natural context such as its natural gene locus) or in genetically modified or exogenously (i.e. artificially) manipulated form.
  • An isolated polynucleotide can, for example, comprise less than approximately 5 kb, 4 kb, 3 kb, 2 kb, 1 kb, 0.5 kb or 0.1 kb of nucleotide sequences which naturally flank the nucleic acid molecule in the genomic DNA of the cell from which the nucleic acid is derived.
  • the polynucleotide preferably, is provided in the form of double or single stranded molecule.
  • polynucleotide encompasses DNA, including cDNA and genomic DNA, or RNA polynucleotides.
  • the present invention also describes polynucleotide variants which are derived from the polynucleotides of the present invention and are capable of interefering with the transcription or translation of the polynucleotides of the present invention.
  • variant polynucleotides include anti-sense nucleic acids, ribozymes, siRNA molecules, morpholino nucleic acids (phosphorodiamidate morpholino oligos), triple-helix forming oligonucleotides, inhibitory oligonucleotides, or micro RNA molecules all of which shall specifically recognize the polynucleotide of the invention due to the presence of complementary or substantially complementary sequences.
  • Suitable variant polynucleotides of the aforementioned kind can be readily designed based on the structure of the polynucleotides of this invention.
  • polynucleotides including naturally occurring modified polynucleotides such as glycosylated or methylated polynucleotides or artificial modified ones such as biotinylated polynucleotides.
  • said polynucleotide further comprises an expression control sequence operatively linked to the said nucleic acid sequence.
  • expression control sequence refers to a nucleic acid sequence which is capable of governing, i.e. initiating and controlling, transcription of a nucleic acid sequence of interest, in the present case the nucleic sequences recited above.
  • a sequence usually comprises or consists of a promoter or a combination of a promoter and enhancer sequences.
  • Expression of a polynucleotide comprises transcription of the nucleic acid molecule, preferably, into a translatable mRNA. Additional regulatory elements may include transcriptional as well as translational enhancers.
  • the following promoters and expression control sequences may be, preferably, used in an expression vector according to the present invention.
  • the cos, tac, trp, tet, trp-tet, Ipp, lac, lpp-lac, laclq, T7, T5, T3, gal, trc, ara, SP6, ⁇ - PR or ⁇ -PL promoters are, preferably, used in Gram-negative bacteria.
  • promoters amy and SPO2 may be used.
  • yeast or fungal promoters ADC1, AOX1r, GAL1, MF ⁇ , AC, P-60, CYC1, GAPDH, TEF, rp28, ADH are, preferably, used.
  • the promoters CMV-, SV40-, RSV-promoter Rosarcoma virus
  • CMV-enhancer SV40-enhancer
  • SV40-enhancer are preferably used.
  • CaMV/35S Franck 1980, Cell 21: 285-294
  • PRP1 Ward 1993, Plant. Mol. Biol. 22
  • SSU Ward 1993, Plant. Mol. Biol. 22
  • OCS OCS
  • lib4 usp
  • STLS1, B33 nos or the ubiquitin or phaseolin promoter.
  • inducible promoters such as the promoters described in EP 0 388 186 A1 (i.e. a benzylsulfonamide-inducible promoter), Gatz 1992, Plant J.
  • tetracyclin-inducible promoter i.e. a tetracyclin-inducible promoter
  • EP 0 335 528 A1 i.e. a abscisic-acid-inducible promoter
  • WO 93/21334 i.e. a ethanol- or cyclohexenol-inducible promoter
  • cytosolic FBPase or the ST-LSI promoter from potato Stockhaus 1989, EMBO J. 8, 2445
  • the phosphoribosyl-pyrophosphate amidotransferase promoter from Glycine max (Genbank accession No.
  • promoters which enable the expression in tissues which are involved in the biosynthesis of fatty acids.
  • seed-specific promoters such as the USP promoter in accordance with the practice, but also other promoters such as the LeB4, DC3, phaseolin or napin promoters.
  • promoters are seed-specific promoters which can be used for monocotyledonous or dicotyledonous plants and which are described in US 5,608,152 (napin promoter from oilseed rape), WO 98/45461 (oleosin promoter from Arobidopsis, US 5,504,200 (phaseolin promoter from Phaseolus vulgaris), WO 91/13980 (Bce4 promoter from Brassica), by Baeumlein et al., Plant J., 2, 2, 1992:233-239 (LeB4 promoter from a legume), these promoters being suitable for dicots.
  • promoters are suitable for monocots: lpt-2 or lpt-1 promoter from barley ( WO 95/15389 and WO 95/23230 ), hordein promoter from barley and other promoters which are suitable and which are described in WO 99/16890 .
  • synthetic promoters either additionally or alone, especially when they mediate a seed-specific expression, such as, for example, as described in WO 99/16890 .
  • seed-specific promoters are utilized to enhance the production of the desired PUFA or LCPUFA.
  • promoters encoded by the nucleic acid sequences shown in any one of SEQ ID NOs: 25, 26, 27, 28, 29 or 30 are used.
  • operatively linked means that the expression control sequence and the nucleic acid of interest are linked so that the expression of the said nucleic acid of interest can be governed by the said expression control sequence, i.e. the expression control sequence shall be functionally linked to the said nucleic acid sequence to be expressed.
  • the expression control sequence and, the nucleic acid sequence to be expressed may be physically linked to each other, e.g., by inserting the expression control sequence at the 5'end of the nucleic acid sequence to be expressed.
  • the expression control sequence and the nucleic acid to be expressed may be merely in physical proximity so that the expression control sequence is capable of governing the expression of at least one nucleic acid sequence of interest.
  • the expression control sequence and the nucleic acid to be expressed are, preferably, separated by not more than 500 bp, 300 bp, 100 bp, 80 bp, 60 bp, 40 bp, 20 bp, 10 bp or 5 bp.
  • said polynucleotide further comprises a terminator sequence operatively linked to the nucleic acid sequence.
  • a terminator sequence operatively linked to the nucleic acid sequence.
  • terminators are encoded by the nucleotide sequences shown in SEQ ID NOs: 36 or 37. More preferably used terminators are encoded by the nucleotide sequences shown in SEQ ID NOs: 31, 32, 33, 34 or 35
  • terminator refers to a nucleic acid sequence which is capable of terminating transcription. These sequences will cause dissociation of the transcription machinery from the nucleic acid sequence to be transcribed. Preferably, the terminator shall be active in plants and, in particular, in plant seeds. Suitable terminators are known in the art and, preferably, include polyadenylation signals such as the SV40-poly-A site or the tk-poly-A site or one of the plant specific signals indicated in Loke et al. ( Loke 2005, Plant Physiol 138, pp. 1457-1468 ), downstream of the nucleic acid sequence to be expressed.
  • the present invention also relates to a vector comprising the polynucleotide of the present invention.
  • vector preferably, encompasses phage, plasmid, viral vectors as well as artificial chromosomes, such as bacterial or yeast artificial chromosomes. Moreover, the term also relates to targeting constructs which allow for random or site- directed integration of the targeting construct into genomic DNA. Such target constructs, preferably, comprise DNA of sufficient length for either homolgous or heterologous recombination as described in detail below.
  • the vector encompassing the polynucleotide of the present invention preferably, further comprises selectable markers for propagation and/or selection in a host. The vector may be incorporated into a host cell by various techniques well known in the art.
  • the vector may reside in the cytoplasm or may be incorporated into the genome. In the latter case, it is to be understood that the vector may further comprise nucleic acid sequences which allow for homologous recombination or heterologous insertion. Vectors can be introduced into prokaryotic or eukaryotic cells via conventional transformation or transfection techniques.
  • transformation and transfection conjugation and transduction, as used in the present context, are intended to comprise a multiplicity of prior-art processes for introducing foreign nucleic acid (for example DNA) into a host cell, including calcium phosphate, rubidium chloride or calcium chloride co-precipitation, DEAE-dextran-mediated transfection, lipofection, natural competence, carbon-based clusters, chemically mediated transfer, electroporation or particle bombardment.
  • foreign nucleic acid for example DNA
  • Suitable methods for the transformation or transfection of host cells, including plant cells can be found in Sambrook et al.
  • plasmid vector may be introduced by heat shock or electroporation techniques. Should the vector be a virus, it may be packaged in vitro using an appropriate packaging cell line prior to application to host cells.
  • the vector referred to herein is suitable as a cloning vector, i.e. replicable in microbial systems.
  • a cloning vector i.e. replicable in microbial systems.
  • Such vectors ensure efficient cloning in bacteria and, preferably, yeasts or fungi and make possible the stable transformation of plants.
  • yeasts or fungi Those which must be mentioned are, in particular, various binary and co-integrated vector systems which are suitable for the T-DNA-mediated transformation.
  • Such vector systems are, as a rule, characterized in that they contain at least the vir genes, which are required for the Agrobacterium-mediated transformation, and the sequences which delimit the T-DNA (T-DNA border).
  • vector systems preferably, also comprise further cis-regulatory regions such as promoters and terminators and/or selection markers with which suitable transformed host cells or organisms can be identified.
  • co-integrated vector systems have vir genes and T-DNA sequences arranged on the same vector
  • binary systems are based on at least two vectors, one of which bears vir genes, but no T-DNA, while a second one bears T-DNA, but no vir gene.
  • the last-mentioned vectors are relatively small, easy to manipulate and can be replicated both in E. coli and in Agrobacterium.
  • binary vectors include vectors from the pBIB-HYG, pPZP, pBecks, pGreen series.
  • Bin19, pBI101, pBinAR, pGPTV and pCAMBIA are Bin19, pBI101, pBinAR, pGPTV and pCAMBIA.
  • An overview of binary vectors and their use can be found in Hellens et al, Trends in Plant Science (2000) 5, 446- 451 .
  • the polynucleotides can be introduced into host cells or organisms such as plants or animals and, thus, be used in the transformation of plants, such as those which are published, and cited, in: Plant Molecular Biology and Biotechnology (CRC Press, Boca Raton, Florida), chapter 6/7, pp. 71-119 (1993 ); F.F. White, Vectors for Gene Transfer in Higher Plants; in: Transgenic Plants, vol.
  • the vector of the present invention is an expression vector.
  • an expression vector i.e. a vector which comprises the polynucleotide of the invention having the nucleic acid sequence operatively linked to an expression control sequence (also called " expression cassette") allowing expression in prokaryotic or eukaryotic cells or isolated fractions thereof.
  • Suitable expression vectors are known in the art such as Okayama-Berg cDNA expression vector pcDV1 (Pharmacia), pCDM8, pRc/CMV, pcDNA1, pcDNA3 (Invitrogene) or pSPORT1 (GIBCO BRL).
  • fusion expression vectors are pGEX ( Pharmacia Biotech Inc; Smith 1988, Gene 67:31-40 ), pMAL (New England Biolabs, Beverly, MA) and pRIT5 (Pharmacia, Piscataway, NJ), where glutathione S-transferase (GST), maltose E-binding protein and protein A, respectively, are fused with the recombinant target protein.
  • GST glutathione S-transferase
  • suitable inducible nonfusion E. coli expression vectors are, inter alia, pTrc ( Amann 1988, Gene 69:301-315 ) and pET 11d ( Studier 1990, Methods in Enzymology 185, 60-89 ).
  • the target gene expression of the pTrc vector is based on the transcription from a hybrid trp-lac fusion promoter by host RNA polymerase.
  • the target gene expression from the pET 11d vector is based on the transcription of a T7-gn10-lac fusion promoter, which is mediated by a coexpressed viral RNA polymerase (T7 gn1).
  • This viral polymerase is provided by the host strains BL21 (DE3) or HMS174 (DE3) from a resident ⁇ -prophage which harbors a T7 gn1 gene under the transcriptional control of the lacUV 5 promoter.
  • the skilled worker is familiar with other vectors which are suitable in prokaryotic organisms; these vectors are, for example, in E.
  • coli pLG338, pACYC184, the pBR series such as pBR322, the pUC series such as pUC18 or pUC19, the M113mp series, pKC30, pRep4, pHS1, pHS2, pPLc236, pMBL24, pLG200, pUR290, plN-III113-B1, ⁇ gt11 or pBdCl, in Streptomyces plJ101, plJ364, plJ702 or plJ361, in Bacillus pUB110, pC194 or pBD214, in Corynebacterium pSA77 or pAJ667.
  • yeast S examples of vectors for expression in the yeast S.
  • vectors and processes for the construction of vectors which are suitable for use in other fungi comprise those which are described in detail in: van den Hondel, C.A.M.J.J., & Punt, P.J. (1991) " Gene transfer systems and vector development for filamentous fungi, in: Applied Molecular Genetics of fungi, J.F.
  • yeast vectors are, for example, pAG-1, YEp6, YEp13 or pEMBLYe23.
  • the polynucleotides of the present invention can be also expressed in insect cells using baculovirus expression vectors.
  • Baculovirus vectors which are available for the expression of proteins in cultured insect cells comprise the pAc series ( Smith 1983, Mol. Cell Biol. 3:2156-2165 ) and the pVL series ( Lucklow 1989, Virology 170:31-39 ).
  • vectors are only a small overview of vectors to be used in accordance with the present invention. Further vectors are known to the skilled worker and are described, for example, in: Cloning Vectors (Ed., Pouwels, P.H., et al., Elsevier, Amsterdam-New York-Oxford, 1985, ISBN 0 444 904018 ). For further suitable expression systems for prokaryotic and eukaryotic cells see the chapters 16 and 17 of Sambrook, loc cit.
  • said vector is an expression vector. More preferably, the said polynucleotide of the present invention is under the control of a seed-specific promoter in the vector of the present invention.
  • a preferred seed-specific promoter as meant herein is selected from the group consisting of Conlinin 1, Conlinin 2, napin, LuFad3, USP, LeB4, Arc, Fae, ACP, LuPXR, and SBP. For details, see, e.g., US 2003-0159174 .
  • the polynucleotide of the present invention can be expressed in single-cell plant cells (such as algae), see Falciatore 1999, Marine Biotechnology 1 (3):239-251 and the references cited therein, and plant cells from higher plants (for example Spermatophytes, such as arable crops) by using plant expression vectors.
  • plant expression vectors comprise those which are described in detail in: Becker 1992, Plant Mol. Biol. 20:1195-1197 ; Bevan 1984, Nucl. Acids Res. 12:8711-8721 ; Vectors for Gene Transfer in Higher Plants; in: Transgenic Plants, Vol. 1, Engineering and Utilization, Ed.: Kung and R. Wu, Academic Press, 1993, p. 15-38 .
  • a plant expression cassette preferably, comprises regulatory sequences which are capable of controlling the gene expression in plant cells and which are functionally linked so that each sequence can fulfill its function, such as transcriptional termination, for example polyadenylation signals.
  • Preferred polyadenylation signals are those which are derived from Agrobacterium tumefaciens T-DNA, such as the gene 3 of the Ti plasmid pTiACH5, which is known as octopine synthase ( Gielen 1984, EMBO J. 3, 835 ) or functional equivalents of these, but all other terminators which are functionally active in plants are also suitable.
  • a plant expression cassette preferably comprises other functionally linked sequences such as translation enhancers, for example the overdrive sequence, which comprises the 5' -untranslated tobacco mosaic virus leader sequence, which increases the protein/RNA ratio ( Gallie 1987, Nucl. Acids Research 15:8693-8711 ).
  • the overdrive sequence which comprises the 5' -untranslated tobacco mosaic virus leader sequence, which increases the protein/RNA ratio
  • plant gene expression must be functionally linked to a suitable promoter which performs the expression of the gene in a timely, cell-specific or tissue-specific manner. Promoters which can be used are constitutive promoters ( Benfey 1989, EMBO J.
  • plant gene expression can also be facilitated via a chemically inducible promoter (for a review, see Gatz 1997, Annu. Rev. Plant Physiol. Plant Mol. Biol., 48:89-108 ). Chemically inducible promoters are particularly suitable if it is desired that genes are expressed in a time-specific manner.
  • promoters examples include a salicylic-acid-inducible promoter ( WO 95/19443 ), a tetracyclin-inducible promoter ( Gatz 1992, Plant J. 2, 397-404 ) and an ethanol-inducible promoter.
  • Promoters which respond to biotic or abiotic stress conditions are also suitable promoters, for example the pathogen-induced PRP1-gene promoter ( Ward 1993, Plant Mol. Biol.
  • the heat-inducible hsp80 promoter from tomato US 5,187,267
  • the cold-inducible alpha-amylase promoter from potato WO 96/12814
  • the wound-inducible pinll promoter EP 0 375 091 A
  • the promoters which are especially preferred are those which bring about the expression of genes in tissues and organs in which fatty acid, lipid and oil biosynthesis takes place, in seed cells such as the cells of endosperm and of the developing embryo.
  • Suitable promoters are the napin gene promoter from oilseed rape ( US 5,608,152 ), the USP promoter from Vicia faba ( Baeumlein 1991, Mol. Gen. Genet.
  • the oleosin promoter from Arabidopsis WO 98/45461
  • the phaseolin promoter from Phaseolus vulgaris US 5,504,200
  • the Bce4 promoter from Brassica WO 91/13980
  • the legumin B4 promoter LoB4; Baeumlein 1992, Plant Journal, 2 (2):233-9
  • promoters which bring about the seed-specific expression in monocotyledonous plants such as maize, barley, wheat, rye, rice and the like.
  • Suitable promoters to be taken into consideration are the Ipt2 or Ipt1 gene promoter from barley ( WO 95/15389 and WO 95/23230 ) or those which are described in WO 99/16890 (promoters from the barley hordein gene, the rice glutelin gene, the rice oryzin gene, the rice prolamin gene, the wheat gliadin gene, wheat glutelin gene, the maize zein gene, the oat glutelin gene, the sorghum kasirin gene, the rye secalin gene).
  • promoters which bring about the plastid-specific expression since plastids are the compartment in which the precursors and some end products of lipid biosynthesis are synthesized.
  • Suitable promoters such as the viral RNA-polymerase promoter, are described in WO 95/16783 and WO 97/06250 , and the clpP promoter from Arabidopsis, described in WO 99/46394 .
  • the present invention relates to a host cell comprising the polynucleotide or the vector of the present invention.
  • host cell is also meant as” host cell culture” .
  • said host cell is a plant cell or plant cell culture and, more preferably, a plant cell obtained from an oilseed crop.
  • said oilseed crop is selected from the group consisting of flax ( Linum sp .), rapeseed ( Brassica sp .), soybean ( Glycine sp .), sunflower ( Helianthus sp .), cotton ( Gossypium sp .), corn ( Zea mays ), olive ( Olea sp .), safflower ( Carthamus sp .), cocoa ( Theobroma cacoa ), peanut ( Arachis sp .), hemp, camelina, crambe, oil palm, coconuts, groundnuts, sesame seed, castor bean, lesquerella, tallow tree, sheanuts, tungnuts, kapok fruit, poppy seed, jojoba seeds and perilla.
  • said host cell is a microorganism. More preferably, said microorganism is a bacterium, a fungus or algae. More preferably, it is selected from the group consisting of Candida, Cryptococcus, Lipomyces, Rhodosporidium, Yarrowia and Schizochytrium.
  • a host cell host cell culture according to the present invention may also be an animal cell.
  • said animal host cell is a host cell of a fish or a cell line obtained therefrom. More preferably, the fish host cell is from herring, salmon, sardine, redfish, eel, carp, trout, halibut, mackerel, zander or tuna.
  • LCPUFAs i.e., the long chain unsaturated fatty acid biosynthetic pathway
  • membrane-associated fatty acid desaturases and elongases Plants and most other eukaryotic organisms have specialized desaturase and elongase systems for the introduction of double bonds and the extension of fatty acids beyond C18 atoms.
  • the elongase reactions have several important features in common with the fatty acid synthase complex (FAS).
  • the elongase complex is different from the FAS complex as the complex is localized in the cytosol and membrane bound, ACP is not involved and the elongase 3-keto-acyl-CoA-synthase catalyzes the condensation of malonyl-CoA with an acyl primer.
  • the elongase complex consists of four components with different catalytic functions, the keto-acyl-synthase (condensation reaction of malonyl-CoA to acyl-CoA, creation of a 2 C atom longer keto-acyl-CoA fatty acid), the keto-acyl-reductase (reduction of the 3-keto group to a 3-hydroxy-group), the dehydratase (dehydration results in a 3-enoyl-acyl-CoA fatty acid) and the enoly-CoA-reductase (reduction of the double bond at position 3, release from the complex).
  • LCPUFAs including ARA, EPA and/or DHA
  • the elongation reactions are essential. Higher plants do not have the necessary enzyme set to produce LCPUFAs (4 or more double bonds, 20 or more C atoms). Therefore the catalytic activities have to be conferred to the plants or plant cells.
  • the polynucleotides of the present invention catalyze the desaturation and elongation activities necessary for the formation of ARA, EPA and/or DHA. By delivering the novel desaturases and elongases increased levels of PUFAs and LCPUFAs are produced.
  • the present invention envisages a host cell which in addition to the polynucleotide of the present invention comprises polynucleotides encoding such desaturases and/or elongases as required depending on the selected host cell.
  • Preferred desaturases and/or elongases which shall be present in the host cell are at least one enzyme selected from the group consisting of: ⁇ -4-desaturase, ⁇ -5-desaturase, ⁇ -5-elongase, ⁇ -6-desaturase, ⁇ 12-desaturase, ⁇ 15-desaturase, ⁇ 3-desaturase and ⁇ -6-elongase.
  • d12d15-Desaturases d12d15Des(Ac) from Acanthamoeba castellanii ( WO2007042510 ), d12d15Des(Cp) from Claviceps purpurea ( WO2008006202 ) and d12d15Des(Lg)1 from Lottia gigantea ( WO2009016202 ), the d12-Desaturases d12Des(Co) from Calendula officinalis ( WO200185968 ), d12Des(Lb) from Laccaria bicolor ( WO2009016202 ), d12Des(Mb) from Monosiga brevicollis ( WO2009016202 ), d12Des(Mg) from Mycosphaerella graminicola ( WO2009016202 ), d12Des(Nh) from Nectria haematococca ( WO2009016202 ), d
  • d5Des(OI)2 from Ostreococcus lucimarinus
  • d5Des(Pp) from Physcomitrella patens
  • d5Des(Pt) from Phaeodactylum tricornutum
  • d5Des(Tc) from Thraustochytrium sp.
  • aditinonally a d6-desaturase, d6-elongase, d5-elongase, d5-desaturase, d12-desaturase, and d6-elongase) or enzymes having essentially the same activity may be combined in a host cell. If the manufacture of EPA is envisaged in higher plants, the enzymes having aditinonally a d6-desaturase, d6-elongase, d5-desaturase, d12-desaturase, d6-elongase, omega 3-desaturase and d15-desaturase, or enzymes having essentially the same activity may be combined in a host cell.
  • the enzymes having aditinonally a d6-desaturase, d6-elongase, d5-desaturase, d12-desaturase, d6-elongase, omega 3-desaturase, d15-desaturase, d5-elongase, and d4-desaturase activity, or enzymes having essentially the same activity may be combined in a host cell.
  • the present invention also relates to a cell, preferably a host cell as specified above or a cell of a non-human organism specified elsewhere herein, said cell comprising a polynucleotide which is obtained from the polynucleotide of the present invention by a point mutation, a truncation, an inversion, a deletion, an addition, a substitution and homologous recombination. How to carry out such modifications to a polynucleotide is well known to the skilled artisan and has been described elsewhere in this specification in detail.
  • the present invention furthermore describes a method for the manufacture of a polypeptide encoded by a polynucleotide of any the present invention comprising
  • Suitable conditions which allow for expression of the polynucleotide of the invention comprised by the host cell depend on the host cell as well as the expression control sequence used for governing expression of the said polynucleotide. These conditions and how to select them are very well known to those skilled in the art.
  • the expressed polypeptide may be obtained, for example, by all conventional purification techniques including affinity chromatography, size exclusion chromatography, high pressure liquid chromatography (HPLC) and precipitation techniques including antibody precipitation. It is to be understood that the method may - although preferred -not necessarily yield an essentially pure preparation of the polypeptide. It is to be understood that depending on the host cell which is used for the aforementioned method, the polypeptides produced thereby may become posttranslationally modified or processed otherwise.
  • the present invention also describes a polypeptide encoded by the polynucleotide of of the present invention or which is obtainable by the aforementioned method.
  • polypeptide encompasses essentially purified polypeptides or polypeptide preparations comprising other proteins in addition. Further, the term also relates to the fusion proteins or polypeptide fragments being at least partially encoded by the polynucleotide of the present invention referred to above. Moreover, it includes chemically modified polypeptides. Such modifications may be artificial modifications or naturally occurring modifications such as phosphorylation, glycosylation, myristylation and the like ( Review in Mann 2003, Nat. Biotechnol. 21, 255- 261 , review with focus on plants in Huber 2004, Curr. Opin. Plant Biol. 7, 318-322 ).
  • polypeptides of the present invention shall exhibit the desaturase or elongase activitiy referred to above.
  • the present invention contemplates a transgenic plant or part thereof comprising the polynucleotide or the expression construct or the vector of the present invention.
  • Preferred plants to be used for introducing the polynucleotide or the vector of the invention are plants which are capable of synthesizing fatty acids, such as all dicotyledonous or monocotyledonous plants, algae or mosses. It is to be understood that host cells derived from a plant may also be used for producing a plant according to the present invention. Preferred plant parts are seeds from the plants.
  • Preferred plants are selected from the group of the plant families Adelotheciaceae, Anacardiaceae, Asteraceae, Apiaceae, Betulaceae, Boraginaceae, Brassicaceae, Bromeliaceae, Caricaceae, Cannabaceae, Convolvulaceae, Chenopodiaceae, Crypthecodiniaceae, Cucurbitaceae, Ditrichaceae, Elaeagnaceae, Ericaceae, Euphorbiaceae, Fabaceae, Geraniaceae, Gramineae, Juglandaceae, Lauraceae, Leguminosae, Linaceae, Prasinophyceae or vegetable plants or ornamentals such as Tagetes.
  • Examples which may be mentioned are the following plants selected from the group consisting of: Adelotheciaceae such as the genera Physcomitrella, such as the genus and species Physcomitrella patens, Anacardiaceae such as the genera Pistacia, Mangifera, Anacardium, for example the genus and species Pistacia vera [pistachio], Mangifer indica [mango] or Anacardium occidentale [cashew], Asteraceae, such as the genera Calendula, Carthamus, Centaurea, Cichorium, Cynara, Helianthus, Lactuca, Locusta, Tagetes, Valeriana, for example the genus and species Calendula officinalis [common marigold], Carthamus tinctorius [safflower], Centaurea cyanus [cornflower], Cichorium intybus [chicory], Cynara scolymus [artichoke], Helianthus annus [sunflower], Lactuca s
  • Crypthecodiniaceae such as the genus Crypthecodinium, for example the genus and species Cryptecodinium cohnii
  • Cucurbitaceae such as the genus Cucurbita, for example the genera and species Cucurbita maxima, Cucurbita mixta, Cucurbita pepo or Cucurbita moschata [pumpkin/squash]
  • Cymbellaceae such as the genera Amphora, Cymbella, Okedenia, Phaeodactylum, Reimeria, for example the genus and species Phaeodactylum tricornutum
  • Ditrichaceae such as the genera Ditrichaceae, Astomiopsis, Cer
  • Elaeagnaceae such as the genus Elaeagnus, for example the genus and species Olea europaea [olive]
  • Ericaceae such as the genus Kalmia, for example the genera and species Kalmia latifolia, Kalmia angustifolia, Kalmia microphylla, Kalmia polifolia, Kalmia occidentalis, Cistus chamaerhodendros or Kalmia lucida [mountain laurel]
  • Euphorbiaceae such as the genera Manihot, Janipha, Jatropha, Ricinus, for example the genera and species Manihot utilissima, Janipha manihot, Jatropha manihot, Manihot aipil, Manihot dulcis, Manihot manihot, Manihot melanobasis, Manihot esculenta [manihot] or Ricinus communis [castor-oil plant],
  • obtusifolia Funaria muhlenbergii, Funaria orcuttii, Funaria plano-convexa, Funaria polaris, Funaria ravenelii, Funaria rubriseta, Funaria serrata, Funaria sonorae, Funaria sublimbatus, Funaria tucsoni, Physcomitrella californica, Physcomitrella patens, Physcomitrella readeri, Physcomitrium australe, Physcomitrium californicum, Physcomitrium collenchymatum, Physcomitrium coloradense, Physcomitrium cupuliferum, Physcomitrium drummondii, Physcomitrium eurystomum, Physcomitrium flexifolium, Physcomitrium hookeri, Physcomitrium hookeri var.
  • glabriusculum Capsicum frutescens [pepper], Capsicum annuum [paprika], Nicotiana tabacum, Nicotiana alata, Nicotiana attenuata, Nicotiana glauca, Nicotiana langsdorffii, Nicotiana obtusifolia, Nicotiana quadrivalvis, Nicotiana repanda, Nicotiana rustica, Nicotiana sylvestris [tobacco], Solanum tuberosum [potato], Solanum melongena [eggplant], Lycopersicon esculentum, Lycopersicon lycopersicum, Lycopersicon pyriforme, Solanum integrifolium or Solanum lycopersicum [tomato], Sterculiaceae, such as the genus Theobroma, for example the genus and species Theobroma cacao [cacao] or Theaceae, such as the genus Camellia, for example
  • preferred plants to be used as transgenic plants in accordance with the present invention are oil fruit crops which comprise large amounts of lipid compounds, such as peanut, oilseed rape, canola, sunflower, safflower, poppy, mustard, hemp, castor-oil plant, olive, sesame, Calendula, Punica, evening primrose, mullein, thistle, wild roses, hazelnut, almond, macadamia, avocado, bay, pumpkin/squash, linseed, soybean, pistachios, borage, trees (oil palm, coconut, walnut) or crops such as maize, wheat, rye, oats, triticale, rice, barley, cotton, cassava, pepper, Tagetes, Solanaceae plants such as potato, tobacco, eggplant and tomato, Vicia species, pea, alfalfa or bushy plants (coffee, cacao, tea), Salix species, and perennial grasses and fodder crops.
  • lipid compounds such as peanut, oilseed rape
  • Preferred plants according to the invention are oil crop plants such as peanut, oilseed rape, canola, sunflower, safflower, poppy, mustard, hemp, castor-oil plant, olive, Calendula, Punica, evening primrose, pumpkin/squash, linseed, soybean, borage, trees (oil palm, coconut).
  • oil crop plants such as peanut, oilseed rape, canola, sunflower, safflower, poppy, mustard, hemp, castor-oil plant, olive, Calendula, Punica, evening primrose, pumpkin/squash, linseed, soybean, borage, trees (oil palm, coconut).
  • Very especially preferred plants are plants such as safflower, sunflower, poppy, evening primrose, walnut, linseed,
  • Preferred mosses are Physcomitrella or Ceratodon.
  • Preferred algae are Isochrysis, Mantoniella, Ostreococcus or Crypthecodinium, and algae/diatoms such as Phaeodactylum or Thraustochytrium.
  • said algae or mosses are selected from the group consisting of: Emiliana, Shewanella, Physcomitrella, Thraustochytrium, Fusarium, Phytophthora, Ceratodon, Isochrysis, Aleurita, Muscarioides, Mortierella, Phaeodactylum, Cryphthecodinium, specifically from the genera and species Thallasiosira pseudonona, Euglena gracilis, Physcomitrella patens, Phytophtora infestans, Fusarium graminaeum, Cryptocodinium cohnii, Ceratodon purpureus, Isochrysis galbana, Aleurita farinosa, Thraustochytrium sp., Muscarioides viallii, Mortierella alpina, Phaeodactylum tricornutum or Caenorhabditis elegans or especially advantageously
  • Transgenic plants may be obtained by transformation techniques as elsewhere in this specification.
  • transgenic plants can be obtained by T-DNA-mediated transformation.
  • Such vector systems are, as a rule, characterized in that they contain at least the vir genes, which are required for the Agrobacterium-mediated transformation, and the sequences which delimit the T-DNA (T-DNA border). Suitable vectors are described elsewhere in the specification in detail.
  • transgenic non-human animals comprising the vector or polynucleotide of the present invention.
  • Preferred non-human transgenic animals are fish, such as herring, salmon, sardine, redfish, eel, carp, trout, halibut, mackerel, zander or tuna.
  • the present invention preferably, describes a non-human transgenic organism specified above which in addition to the polynucleotide of the present invention comprises polynucleotides encoding such desaturases and/or elongases as required depending on the selected host cell.
  • Preferred desaturases and/or elongases which shall be present in the organism are at least one enzyme selected from the group of desaturases and/or elongases or the combinations specifically recited elsewhere in this specification (see above and Tables 3, 4 and 5).
  • the present invention describes a method for the manufacture of polyunsaturated fatty acids comprising:
  • polyunsaturated fatty acids refers to fatty acids comprising at least two, preferably, three, four, five or six, double bonds. Moreover, it is to be understood that such fatty acids comprise, preferably from 18 to 24 carbon atoms in the fatty acid chain. More preferably, the term relates to long chain PUFA (LCPUFA) having from 20 to 24 carbon atoms in the fatty acid chain.
  • PUFA polyunsaturated fatty acids
  • Preferred unsaturated fatty acids in the sense of the present invention are selected from the group consisting of DGLA 20:3 (8,11,14), ARA 20:4 (5,8,11,14), iARA 20:4(8,11,14,17), EPA 20:5 (5,8,11,14,17), DPA 22:5 (4,7,10,13,16), DHA 22:6 (4,7,10,13,16,19), 20:4 (8,11,14,17), more preferably, arachidonic acid (ARA) 20:4 (5,8,11,14), eicosapentaenoic acid (EPA) 20:5 (5,8,11,14,17), and docosahexaenoic acid (DHA) 22:6 (4,7,10,13,16,19).
  • DGLA 20:3 8,11,14
  • ARA 20:4 (5,8,11,14), iARA 20:4(8,11,14,17), EPA 20:5 (5,8,11,14,17), D
  • substrates encompass LA 18:2 (9,12), ALA 18:3(9,12,15), Eicosadienoic acid 20:2 (11,14), Eicosatrienoic acid 20:3 (11,14,17)), DGLA 20:3 (8,11,14), ARA 20:4 (5,8,11,14), eicosatetraenoic acid 20:4 (8,11,14,17), Eicosapentaenoic acid 20:5 (5,8,11,14,17), Docosahexapentanoic acid 22:5 (7,10,13,16,19).
  • cultivating refers maintaining and growing the host cells under culture conditions which allow the cells to produce the said polyunsaturated fatty acid, i.e. the PUFA and/or LCPUFA referred to above. This implies that the polynucleotide of the present invention is expressed in the host cell so that the desaturase and/or elongase activity is present. Suitable culture conditions for cultivating the host cell are described in more detail below.
  • the term" obtaining encompasses the provision of the cell culture including the host cells and the culture medium as well as the provision of purified or partially purified preparations thereof comprising the polyunsaturated fatty acids, preferably, ARA, EPA, DHA, in free or in -CoA bound form, as membrane phospholipids or as triacylglyceride estres. More preferably, the PUFA and LCPUFA are to be obtained as triglyceride esters, e.g., in form of an oil. More details on purification techniques can be found elsewhere herein below.
  • the host cells to be used in the method of the invention are grown or cultured in the manner with which the skilled worker is familiar, depending on the host organism.
  • host cells are grown in a liquid medium comprising a carbon source, usually in the form of sugars, a nitrogen source, usually in the form of organic nitrogen sources such as yeast extract or salts such as ammonium sulfate, trace elements such as salts of iron, manganese and magnesium and, if appropriate, vitamins, at temperatures of between 0°C and 100°C, preferably between 10°C and 60°C under oxygen or anaerobic atmosphere depedent on the type of organism.
  • the pH of the liquid medium can either be kept constant, that is to say regulated during the culturing period, or not.
  • the cultures can be grown batchwise, semibatchwise or continuously. Nutrients can be provided at the beginning of the fermentation or administerd semicontinuously or continuously:
  • the produced PUFA or LCPUFA can be isolated from the host cells as described above by processes known to the skilled worker, e.g., by extraction, distillation, crystallization, if appropriate precipitation with salt, and/or chromatography. It might be required to disrupt the host cells prior to purification. To this end, the host cells can be disrupted beforehand.
  • the culture medium to be used must suitably meet the requirements of the host cells in question.
  • culture media for various microorganisms which can be used as host cells according to the present invention can be found in the textbook " Manual of Methods for General Bacteriology” of the American Society for Bacteriology (Washington D.C., USA, 1981 ).
  • Culture media can also be obtained from various commercial suppliers. All media components are sterilized, either by heat or by filter sterilization. All media components may be present at the start of the cultivation or added continuously or batchwise, as desired.
  • the polynucleotide or vector of the invention which has been introduced in the host cell further comprises an expressible selection marker, such as an antibiotic resistance gene, it might be necessary to add a selection agent to the culture, such as a antibiotic in order to maintain the stability of the introduced polynucleotide.
  • the culture is continued until formation of the desired product is at a maximum. This is normally achieved within 10 to 160 hours.
  • the fermentation broths can be used directly or can be processed further.
  • the biomass may, according to requirement, be removed completely or partially from the fermentation broth by separation methods such as, for example, centrifugation, filtration, decanting or a combination of these methods or be left completely in said broth.
  • the fatty acid preparations obtained by the method of the invention e.g., oils, comprising the desired PUFA or LCPUFA as triglyceride esters are also suitable as starting material for the chemical synthesis of further products of interest. For example, they can be used in combination with one another or alone for the preparation of pharmaceutical or cosmetic compositions, foodstuffs, or animal feeds.
  • Chemically pure triglycerides comprising the desired PUFA or LCPUFA can also be manufactured by the methods described above. To this end, the fatty acid preparations are further purified by extraction, distillation, crystallization, chromatography or combinations of these methods. In order to release the fatty acid moieties from the triglycerides, hydrolysis may be also required.
  • the said chemically pure triglycerides or free fatty acids are, in particular, suitable for applications in the food industry or for cosmetic and pharmacological compositions.
  • the present invention describes a method for the manufacture of poly-unsaturated fatty acids comprising:
  • an oil, lipid or fatty acid composition is also described by the present invention comprising the steps of any one of the aforementioned methods and the further step of formulating PUFA or LCPUFA as oil, lipid or fatty acid composition.
  • said oil, lipid or fatty acid composition is to be used for feed, foodstuffs, cosmetics or medicaments.
  • the formulation of the PUFA or LCPUFA shall be carried out according to the GMP standards for the individual envisaged products.
  • an oil may be obtained from plant seeds by an oil mill.
  • sterilization may be required under the applicable GMP standard.
  • Similar standards will apply for lipid or fatty acid compositions to be applied in cosmetic or pharmaceutical compositions. All these measures for formulating oil, lipid or fatty acid compositions as products are comprised by the aforementioned manufacture.
  • oil refers to a fatty acid mixture comprising unsaturated and/or saturated fatty acids which are esterified to triglycerides.
  • the triglycerides in the oil of the invention comprise PUFA or LCPUFA as referred to above.
  • the amount of esterified PUFA and/or LCPUFA is, preferably, approximately 30%, a content of 50% is more preferred, a content of 60%, 70%, 80% or more is even more preferred.
  • the oil may further comprise free fatty acids, preferably, the PUFA and LCPUFA referred to above.
  • the fatty acid content can be, e.g., determined by GC analysis after converting the fatty acids into the methyl esters by transesterification.
  • the content of the various fatty acids in the oil or fat can vary, in particular depending on the source.
  • the oil shall have a non-naturally occurring composition with respect to the PUFA and/or LCPUFA composition and content. It will be understood that such a unique oil composition and the unique esterification pattern of PUFA and LCPUFA in the triglycerides of the oil shall only be obtainable by applying the methods of the present invention specified above.
  • the oil of the invention may comprise other molecular species as well. Specifically, it may comprise minor impurities of the polynucleotide or vector of the invention. Such impurities, however, can be detected only by highly sensitive techniques such as PCR.
  • Another embodiment is the use of the polynucleotide comprising the NEENA or the recombinant vector comprising the polynucleotide with the NEENA as defined above for enhancing expression of at least one enzyme of the polyunsaturated fatty acid biosynthetic pathway as defined in plants or parts thereof, in a more preferably embodiment the polynucleotide comprising the NEENA or the recombinant vector comprising the polynucleotide with the NEENA as defined above for enhancing expression of at least one enzyme of the polyunsaturated fatty acid biosynthetic pathway is used in plant seeds.
  • Another preferred embodiment is the use of a host cell or a host cell culture or of a transgenic plant, plant parts or plant seeds derived from the transgenic plant as decribed above for the production of a polyunsaturated fatty acid or for the production of foodstuffs, animal feeds, seeds, pharmaceuticals or fine chemicals.
  • the polyunsaturated fatty acid is arachidonic acid, eicosapentaenoic acid or docosahexaenoic acid.
  • NEENA nucleic acid expression enhancing nucleic acid
  • GFP green fluorescence protein
  • GUS beta-Glucuronidase
  • BAP 6-benzylaminopurine
  • MS Murashige and Skoog medium
  • Kan Kanamycin sulfate
  • GA3 Gibberellic acid
  • microl Microliter.
  • the sequences are written one underneath the other for an optimal comparison (for example gaps may be inserted into the sequence of a protein or of a nucleic acid in order to generate an optimal alignment with the other protein or the other nucleic acid).
  • amino acid residues or nucleic acid molecules at the corresponding amino acid positions or nucleotide positions are then compared. If a position in one sequence is occupied by the same amino acid residue or the same nucleic acid molecule as the corresponding position in the other sequence, the molecules are homologous at this position (i.e. amino acid or nucleic acid " homology” as used in the present context corresponds to amino acid or nucleic acid " identity” .
  • Cloning methods as e.g. use of restriction endonucleases to cut double stranded DNA at specific sites, agarose gel electrophoreses, purification of DNA fragments, transfer of nucleic aicds onto nitrocellulose and nylon memebranes, joining of DNA-fragments, transformation of E.coli cells and culture of bacteria where perforemed as described in Sambrook et al. (1989) (Cold Spring Harbor Laboratory Press: ISBN 0-87965-309-6). Polymerase chain reaction was performed using PhusionTM High-Fidelity DNA Polymerase (NEB, Frankfurt, Germany) according to the manufactures instrucions.
  • primers used in PCR were designed such, that at least 20 nucleotides of the 3' end of the primer anneal perfectly with the template to amplify. Restriction site were added by attaching the corresponing nucleotides of the recognition sites to the 5' end of the primer.
  • Fusion PCR for example described by K. Heckman and L. R. Pease, Nature Protocols (2207) 2, 924- 932 was used as an alternative method to join two fragments of interest, e.g. a promoter to a gene or a gene to a terminator.
  • Sequencing of recombinant DNA-molecules was performed using a laser-fluorescence DNA sequencer (Applied Biosystems Inc, USA) employing the sanger method ( Sanger et al. (1977) Proc. Natl. Acad. Sci. USA 74, 5463-5467 ).
  • Expression constructs harboring fragments obtained by polymerase chain reactions (PCR) were subjected to sequencing to confirm the correctness of expression cassettes consisting of promoter, nulceic acid molecule to be expressed and terminator to avoid mutations that might result from handling of the DNA during cloning, e.g. due to incorrect primers, mutations from exposure to UV-light or errors of polymerases.
  • NEENAss seed specific NEENA candidates
  • Genomic DNA was extracted from A. thaliana green tissue using the Qiagen DNeasy Plant Mini Kit (Qiagen, Hilden, Germany). Genomic DNA fragments containing NEENA molecules were isolated by conventional polymerase chain reaction (PCR). Primers were designed on the basis of the A . thaliana genome sequence with a multitude of NEENA candidates. The reaction comprised 19 sets of primers (Table 2) and followed the protocol outlined by Phusion High Fidelity DNA Polymerase (Cat No F-540L, New England Biolabs, Ipswich, MA, USA).
  • a touch-down approach was employed for the PCR with the following parameters: 98,0°C for 30 sec (1 cycle), 98,0°C for 30 sec, 56,0°C for 30 sec and 72,0°C for 60 sec (4 cycles), 4 additional cycles each for 54,0°C, 51,0°C and 49,0°C annealing temperature, followed by 20 cycles with 98,0°C for 30 sec, 46,0°C for 30 sec and 72,0°C for 60 sec (4 cycles) and 72,0°C for 5 min.
  • the amplification products was loaded on a 2 % (w/v) agarose gel and separated at 80V.
  • PCR products were excised from the gel and purified with the Qiagen Gel Extraction Kit (Qiagen, Hilden, Germany).
  • the purified PCR prudcts were cloned into the pCR2.1 TOPO (Invitrogen) vector according to the manufacturer' s manual and subsequently sequenced. These plasmids served as source for further cloning steps or as template for further PCR, e.g. fusion PCR for fusion with promotors as described in example 4.
  • primer combinations are listed in table 6 were used to create fusions of promoter-NEENAs harbored by the plasmid VC-LJB2003-1qcz (SEQ-ID 40) and VC-LJB2197-1qcz (SEQ-ID 146) containing the required set of pathway genes to synthesize arachidonic acid in seeds of rapeseed.
  • MCS multiple cloning site
  • the Multisite GatewayTM System (Invitrogen) was used to combine three expression cassette harbored by pENTR/A, pENTR/B and pENTR/C ( figure 2E ) to obtain the final binary pSUN T-plasmids VC-LJB913-1qcz (SEQ-ID 38), VC-LJB1327-1qcz (SEQ-ID 39) and VC-LJB2003-1qcz (SEQ-ID 40) and VC-LJB2197-1qcz (SEQ-ID 146).
  • the orientation and combination of the functional elements is depicted in figure 3A , 3B , 3C and 3D .
  • constructs harboring functional expression modules for synthesis of docosahexaenoic acid (DHA) in rapeseed can be obtained in a similar manner.
  • DHA docosahexaenoic acid
  • constructs also contain functional modules required for the expression of the genes listed in table 4. Promotors used in those expression modules can be SEQ-ID No. 25, 26, 27, 28, 29 and/or 30, the NEENA can be SEQ-ID No. 10, and terminators can be SEQ-ID No. 31, 32, 33, 34, 35, 36 and 37.
  • transgenic rapeseed plants For the generation of transgenic rapeseed plants, the binary vectors described in example 3 were transformed into Agrobacterium tumefaciens C58C1:pGV2260 ( Deblaere et al. 1984, Nucl. Acids. Res. 13: 4777-4788 ).
  • Agrobacterium tumefaciens C58C1:pGV2260 Deblaere et al. 1984, Nucl. Acids. Res. 13: 4777-4788 .
  • rapeseed plants cv. Kumily, a 1:50 dilution of an overnight culture of positive transformed acrobacteria colonies grown in Murashige-Skoog Medium ( Murashige and Skoog 1962 Physiol. Plant. 15, 473 ) supplemented by 3% saccharose (3MS-Medium) was used.
  • Petiols or Hypocotyledones of sterial rapeseed plants were incubated in a petri dish with a 1:50 acrobacterial dilusion for 5-10 minutes. This was followed by a tree day co-incubation in darkness at 25°C on 3MS-Medium with 0.8% bacto-Agar. After three days the culture was put on to 16 hours light/8 hours darkness weekly on MS-medium containing 500mg/l Claforan (Cefotaxime-Natrium), 100 nM Imazetapyr, 20 mikroM Benzylaminopurin (BAP) and 1,6g/l Glucose.
  • Regenerated sprouts have been obtained on 2MS-Medium with Imazetapyr and Claforan and were transferred to the green house for sprouting. After flowering, the mature seeds were harvested and analysed for expression of the Desaturase gene via lipid analysis as described in Qui et al. 2001, J. Biol. Chem. 276, 31561-31566 .
  • transgenic flax plants can be carried out according to the method of Bell et al., 1999, In Vitro Cell. Dev. Biol. Plant 35(6):456-465 using particle bombardment. Acrobacterial transformation could be carried out according to Mlynarova et al. (1994), Plant Cell Report 13: 282-285 .
  • Example 6 Lipid extraction and lipid analysis of plant oils
  • the results of genetic modifications in plants or on the production of a desired molecule can be determined by growing the plant under suitable conditions, e.g. as described below, and analysing the growth media and/or the cellular components for enhanced production of the desired molecule, e.g. lipids or a certain fatty acid.
  • Lipids can be extracted as described in the standard literature including Ullman, Encyclopedia of Industrial Chemistry, Bd. A2, S. 89-90 und S. 443-613, VCH: Weinheim (1985 ); Fallon, A., et al., (1987) "Applications of HPLC in Biochemistry” in: Laboratory Techniques in Biochemistry and Molecular Biology, Bd. 17 ; Rehm et al.
  • the binary T-plasmids described in example 4 were transformed into rapeseed (Brassica napus) as described in example 5. After selection of transgenic plants using PCR, plats were grown until development of mature seeds (Day/night cycle: 16h at 200mE and 21°C, 8h at darkness and 19°C). Fatty acids from harvested seeds were extracted and analysed using gas chromatography. Based on the analysed lipids, the effect of the NEENAs on expression of desaturases and elongases can be determined since the lipid pattern of successfully transformed plant seeds will differ from the pattern of control plant seeds, e.g. of plants expressing a set of desaturases and elongases without the enhancing effect of NEENAs. Table 7 shows results of single seed measurements of the five best performing transgenic lines obtained for each binary T-plasmid. Table 8 shows the nomenclature for the fatty acids listed in the header of table 3.
  • transgenic plants obtained from transformations with construct VC-VC-LJB1327-1qcz (SEQ-ID 39) VC-LJB2003-1qcz (SEQ-ID 40) and VC-LJB2197-1qcz (SEQ-ID 146) showed a much higher ARA to GLA ratio compared to plants transformed with VC-LJB913-1qcz (SEQ-ID 38) and was highest for plants transformed with VC-LJB2003-1qcz (ARA:GLA ratio of up to 53.3). Such a ratio is benefitial if GLA is not desired.
  • Table 8 Used Nomenclature Fatty acid Nomenclature Oleic acid 18:1 ⁇ 9 18:1n-9 Linoleic acid 18:2 ⁇ 6,12 18:2n-6 ⁇ -Linolenic acid 18:3 ⁇ 9,12,15 ⁇ 18:3n-3 ⁇ -Linolenic acid 18:3 ⁇ 6,9,12 ⁇ 18:3n-6 Stearidonic acid 18:4 ⁇ 6,9,12,15 18:4n-3 Dihomo- ⁇ -linolenic acid 20:3 ⁇ 8,11,14 20:3n-6 Eicosatrienoic acid 20:3 ⁇ 11,14,17 20:3n-3 iso-Arachidonic acid 20:4 ⁇ 8,11,14,17 20:4n-3 Arachidonic acid 20:4 ⁇ 5,8,11,14 20:4n-6 Eicosapentaenoic acid 20:5 ⁇ 5,8,11,14,17 20:5n-3

Claims (12)

  1. Polynucléotide comprenant un promoteur spécifique de graine et un élément augmentant l'expression hétérologue (NEENA) fonctionnellement lié audit promoteur, et comprenant en outre une séquence d'acide nucléique à exprimer sous le contrôle dudit promoteur, où le NEENA est choisi parmi
    i) une molécule d'acide nucléique telle que décrite dans la séquence d'acide nucléique de SEQ ID NO. 10,
    ii) une molécule d'acide nucléique ayant au moins 80 % d'identité de séquence avec la séquence d'acide nucléique de i), où ladite molécule d'acide nucléique augmente l'expression de la séquence d'acide nucléique à exprimer sous le contrôle dudit promoteur, et
    iii) une molécule d'acide nucléique d'au moins 100 bases consécutives d'une séquence d'acide nucléique de i) ou ii) qui augmente l'expression de la séquence d'acide nucléique à exprimer sous le contrôle dudit promoteur.
  2. Polynucléotide de la revendication 1, caractérisé en ce que la séquence d'acide nucléique à exprimer sous le contrôle dudit promoteur code pour un polypeptide ayant une activité désaturase ou élongase.
  3. Polynucléotide de la revendication 2, comprenant en outre une séquence d'acide nucléique codant pour un polypeptide ayant
    i) une activité bêta-cétoacyle réductase,
    ii) une activité déshydratase, et/ou
    iii) une activité énoyl-CoA réductase,
    où les séquences d'acide nucléique définies dans i) à iii) sont hétérologues avec ledit polypeptide ayant une activité désaturase ou élongase.
  4. Polynucléotide de la revendication 2 ou 3, comprenant en outre au moins une séquence d'acide nucléique codant pour un polypeptide ayant une activité acyle transférase, où la séquence d'acide nucléique est hétérologue avec ledit polypeptide ayant une activité désaturase, élongase, bêta-cétoacyle réductase, déshydratase ou énoyl-CoA réductase.
  5. Polynucléotide de l'une quelconque des revendications 2 à 4, comprenant en outre un terminateur fonctionnellement lié à ladite séquence d'acide nucléique codant pour un polypeptide ayant une activité désaturase ou élongase.
  6. Construction d'expression comprenant le polynucléotide de l'une quelconque des revendications 1 à 5, dans laquelle le promoteur est fonctionnel dans une partie d'une plante ou cellule de plante, et dans laquelle le promoteur est fonctionnellement lié à une séquence nucléotidique d'intérêt à exprimer dans ladite partie d'une plante ou cellule de plante.
  7. Vecteur comprenant le polynucléotide de l'une quelconque des revendications 1 à 5 ou la construction d'expression de la revendication 6.
  8. Cellule hôte ou plante transgénique ou partie de celle-ci, comprenant le polynucléotide de l'une quelconque des revendications 1 à 5 ou la construction d'expression de la revendication 6 ou le vecteur de la revendication 7.
  9. Procédé d'augmentation d'expression génique spécifique dans une graine, comprenant les étapes de
    i) transformation d'une cellule de plante avec un polynucléotide selon l'une quelconque des revendications 1 à 5, et
    ii) expression de la séquence d'acide nucléique à exprimer.
  10. Utilisation d'une molécule d'acide nucléique choisie parmi
    i) une molécule d'acide nucléique telle que décrite dans la séquence d'acide nucléique de SEQ ID NO. 10,
    ii) une molécule d'acide nucléique ayant au moins 80 % d'identité de séquence avec la séquence d'acide nucléique de i),
    où ladite molécule d'acide nucléique augmente l'expression de la séquence d'acide nucléique à exprimer sous le contrôle d'un promoteur spécifique de graine,
    ii) une molécule d'acide nucléique d'au moins 100 bases consécutives d'une séquence d'acide nucléique de i) ou ii) qui augmente l'expression de la séquence d'acide nucléique à exprimer sous le contrôle d'un promoteur spécifique de graine pour
    - augmenter l'expression d'une séquence d'acide nucléique à exprimer, ou
    - augmenter l'expression d'un polypeptide ayant une activité désaturase ou élongase.
  11. Utilisation de la cellule hôte ou plante transgénique ou une partie de celle-ci selon la revendication 8 pour
    - produire un acide gras polyinsaturé, ou
    - produire des aliments, des aliments pour animaux, des graines, un matériau de propagation, des produits pharmaceutiques ou des produits de chimie fine.
  12. Utilisation de la revendication 11, dans laquelle l'acide gras polyinsaturé est l'acide arachidonique, l'acide eicosapentaénoïque ou l'acide docosahexaénoïque.
EP16205641.0A 2009-08-31 2010-08-27 Molécules d'acide nucléique régulatrices pour l'amélioration de l'expression de gènes spécifiques des semences dans des plantes pour faciliter la synthèse améliorée d'acides gras polyinsaturés Active EP3178937B1 (fr)

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US9428757B2 (en) 2016-08-30
AU2010288482A1 (en) 2012-04-12
EP3121283A1 (fr) 2017-01-25
EP3418387A1 (fr) 2018-12-26
WO2011023800A1 (fr) 2011-03-03
SG178872A1 (en) 2012-04-27
CA2772267A1 (fr) 2011-03-03
IL218284A0 (en) 2012-04-30
JP2016028583A (ja) 2016-03-03
CN112011566A (zh) 2020-12-01
EP3121283B1 (fr) 2018-05-02
EP3418387B1 (fr) 2020-11-25
CN112011566B (zh) 2023-12-05
EP2473609B1 (fr) 2016-10-12
CN106222166B (zh) 2020-09-08
EP3178937A1 (fr) 2017-06-14
CN106222166A (zh) 2016-12-14
ZA201202248B (en) 2013-06-26
JP2013502914A (ja) 2013-01-31
CN102597245A (zh) 2012-07-18
EP2473609A1 (fr) 2012-07-11
US20120185965A1 (en) 2012-07-19

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